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Free tool

Standard drink calculator

Enter the size and strength of a drink to see how much alcohol it really contains — in grams, US standard drinks, UK units and other countries’ standard drinks.

14grams of alcohol
1US standard drinks (14 g)
1.8UK units (8 g)
1.4AU / IE / NZ drinks (10 g)
1Canadian drinks (13.45 g)

Grams = volume (ml) × ABV ÷ 100 × 0.789. UK units = volume (ml) × ABV ÷ 1000. Results are estimates; check the label for the exact strength.

How the calculator works

Every country’s guideline counts drinks as a fixed amount of pure alcohol, not as a glass. The calculator takes the volume and alcohol by volume (ABV) of your drink, converts it into grams of ethanol, then divides by each country’s standard: 14 g in the US, 8 g for a UK unit, 10 g in Australia, Ireland and New Zealand, and 13.45 g in Canada.

For the full explanation and a table of common drinks, read what is a standard drink. To see how your weekly total compares with health guidelines, read how many drinks a week is too many.

Frequently asked questions

How do I calculate standard drinks?

Multiply the volume in ml by the ABV percentage, divide by 100 and multiply by 0.789 to get grams of alcohol. Then divide by your country’s standard drink size, for example 14 g in the US.

How many units are in a bottle of wine?

A 750 ml bottle of 13% wine contains about 9.8 UK units, or about 5.5 US standard drinks.

How many standard drinks are in a pint of beer?

A UK pint (568 ml) of 5% beer is about 2.8 UK units or 1.6 US standard drinks. A US pint (473 ml) of 5% beer is about 1.3 US standard drinks.